Results 241 to 250 of about 75,447 (292)
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Late Cretaceous and paroxysmal Cretaceous/Tertiary extinctions
Nature, 1987The various geological signatures at Cretaceous/ Tertiary time including iridium and other associated elements, microspherules, and shock deformation features are compatible with the suggestion that the transition is marked by a period of intense volcanism.
Charles B. Officer +3 more
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Cretaceous Dinosaur Extinction
Evolution, 1968The reign of dinosaurs, dominant on land for about 150 million years, terminated at the close of the Cretaceous. They did not all disappear at precisely the same moment, but from a peak of about 120 genera near the middle of the period, dwindled in numbers down to the end of Cretaceous at which time a large number of genera became extinct (Newell, 1962;
Daniel I, Axelrod, Harry P, Bailey
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The Cretaceous-Tertiary Transition
Science, 1983The fossil sequences from cores across the Cretaceous-Tertiary boundary show a range of transition times and transition time intervals depending on the fossil indicators and the location of the site. These variations, together with the pattern of iridium distribution with depth at some sites, differences in total amounts of iridium, variations in noble
C B, Officer, C L, Drake
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Bornaviruses from the Cretaceous
Nature Reviews Microbiology, 2021Analysis of endogenous viral elements reveals that bornaviruses already infected hosts 100 million years ago.
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1993
AbstractCretaceous rocks extend through the mid-continent from northern Yukon Territory and District of Mackenzie southward along Mackenzie and Rocky Mountains and eastward across the Plains of Alberta, Saskatchewan, and Manitoba to the Canadian Shield. They underlie Mackenzie Delta and Plains in the District of Mackenzie. Exposures of Cretaceous rocks
D.F. Stott +7 more
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AbstractCretaceous rocks extend through the mid-continent from northern Yukon Territory and District of Mackenzie southward along Mackenzie and Rocky Mountains and eastward across the Plains of Alberta, Saskatchewan, and Manitoba to the Canadian Shield. They underlie Mackenzie Delta and Plains in the District of Mackenzie. Exposures of Cretaceous rocks
D.F. Stott +7 more
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Science, 1978
Exceptionally well preserved larval bivalve shells have been isolated from Late Cretaceous (Maestrichtian) sediments. Specimens were readily identified to familial level on the basis of gross morphology and hinge structures. Reconstruction of fossil larval ontogeny, linked with the distribution of adult stages, will provide an important interpretative ...
R A, Lutz, D, Jablonski
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Exceptionally well preserved larval bivalve shells have been isolated from Late Cretaceous (Maestrichtian) sediments. Specimens were readily identified to familial level on the basis of gross morphology and hinge structures. Reconstruction of fossil larval ontogeny, linked with the distribution of adult stages, will provide an important interpretative ...
R A, Lutz, D, Jablonski
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1994
Abstract Pangaea experienced further disintegration during the Cretaceous. The main body of Laurasia approached its modem location but the Eurasian part deviated remarkably south-westward, forming an angle of several tens of degrees with modem latitudes.
Liu Benpei, Xu Yuling,, Chen Feng
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Abstract Pangaea experienced further disintegration during the Cretaceous. The main body of Laurasia approached its modem location but the Eurasian part deviated remarkably south-westward, forming an angle of several tens of degrees with modem latitudes.
Liu Benpei, Xu Yuling,, Chen Feng
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Response—Cretaceous Extinctions
Science, 2010The Letters by Archibald et al. , Keller et al. , and Courtillot and Fluteau question our conclusion that the Cretaceous-Paleogene mass extinction was caused by the asteroid impact at Chicxulub.
Schulte, Peter +39 more
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Nature, 1970
Two fleas have been collected in association with abundant remains of fish, plants, phyllopod Crustacea (Conchostraca, Anostraca and Cladocera) and other insects in a Lower Cretaceous siltstone at Koonwarra, southern Gippsland, Australia. The insect fauna consists mainly of the aquatic immature stages of Ephemeroptera (mayflies), Diptera (midges ...
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Two fleas have been collected in association with abundant remains of fish, plants, phyllopod Crustacea (Conchostraca, Anostraca and Cladocera) and other insects in a Lower Cretaceous siltstone at Koonwarra, southern Gippsland, Australia. The insect fauna consists mainly of the aquatic immature stages of Ephemeroptera (mayflies), Diptera (midges ...
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Lepidoptera in Cretaceous Amber
Science, 1970The discovery of the head capsule of a lepidopterous larva in Canadian amber of the Cretaceous period is the first fossil evidence of Lepidoptera before the Tertiary period.
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